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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.bytes;
import java.nio.charset.StandardCharsets;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.io.Channels;
import org.elasticsearch.common.io.stream.ByteBufferStreamInput;
import org.elasticsearch.common.io.stream.StreamInput;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.util.CharsetUtil;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.GatheringByteChannel;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
/**
* Note: this is only used by one lone test method.
*/
public class ByteBufferBytesReference implements BytesReference {
private final ByteBuffer buffer;
public ByteBufferBytesReference(ByteBuffer buffer) {
this.buffer = buffer;
}
@Override
public byte get(int index) {
return buffer.get(buffer.position() + index);
}
@Override
public int length() {
return buffer.remaining();
}
@Override
public BytesReference slice(int from, int length) {
ByteBuffer dup = buffer.duplicate();
dup.position(buffer.position() + from);
dup.limit(buffer.position() + from + length);
return new ByteBufferBytesReference(dup);
}
@Override
public StreamInput streamInput() {
return new ByteBufferStreamInput(buffer);
}
@Override
public void writeTo(OutputStream os) throws IOException {
if (buffer.hasArray()) {
os.write(buffer.array(), buffer.arrayOffset() + buffer.position(), buffer.remaining());
} else {
byte[] tmp = new byte[8192];
ByteBuffer buf = buffer.duplicate();
while (buf.hasRemaining()) {
buf.get(tmp, 0, Math.min(tmp.length, buf.remaining()));
os.write(tmp);
}
}
}
@Override
public void writeTo(GatheringByteChannel channel) throws IOException {
Channels.writeToChannel(buffer, channel);
}
@Override
public byte[] toBytes() {
if (!buffer.hasRemaining()) {
return BytesRef.EMPTY_BYTES;
}
byte[] tmp = new byte[buffer.remaining()];
buffer.duplicate().get(tmp);
return tmp;
}
@Override
public BytesArray toBytesArray() {
if (buffer.hasArray()) {
return new BytesArray(buffer.array(), buffer.arrayOffset() + buffer.position(), buffer.remaining());
}
return new BytesArray(toBytes());
}
@Override
public BytesArray copyBytesArray() {
return new BytesArray(toBytes());
}
@Override
public ChannelBuffer toChannelBuffer() {
return ChannelBuffers.wrappedBuffer(buffer);
}
@Override
public boolean hasArray() {
return buffer.hasArray();
}
@Override
public byte[] array() {
return buffer.array();
}
@Override
public int arrayOffset() {
return buffer.arrayOffset() + buffer.position();
}
@Override
public int hashCode() {
return Helper.bytesHashCode(this);
}
@Override
public boolean equals(Object obj) {
return Helper.bytesEqual(this, (BytesReference) obj);
}
@Override
public String toUtf8() {
if (!buffer.hasRemaining()) {
return "";
}
final CharsetDecoder decoder = CharsetUtil.getDecoder(StandardCharsets.UTF_8);
final CharBuffer dst = CharBuffer.allocate(
(int) ((double) buffer.remaining() * decoder.maxCharsPerByte()));
try {
CoderResult cr = decoder.decode(buffer, dst, true);
if (!cr.isUnderflow()) {
cr.throwException();
}
cr = decoder.flush(dst);
if (!cr.isUnderflow()) {
cr.throwException();
}
} catch (CharacterCodingException x) {
throw new IllegalStateException(x);
}
return dst.flip().toString();
}
@Override
public BytesRef toBytesRef() {
if (buffer.hasArray()) {
return new BytesRef(buffer.array(), buffer.arrayOffset() + buffer.position(), buffer.remaining());
}
return new BytesRef(toBytes());
}
@Override
public BytesRef copyBytesRef() {
return new BytesRef(toBytes());
}
}
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